Drying of foods and grains are done for food preservation. It prevents growth of bacteria, yeasts and other microorganisms through removal of water content from it. The utilization of artificial roughness, such as ribs, on the underside of the absorber plate of a solar air heater (SAH) has been widely recognized as an effective method to enhance its thermal performance. Various experimental and computational studies have been conducted to enhance heat transfer from the absorber plate to the flowing air in SAH systems. This study presents a computational investigation into the impact of employing V-ribs as roughness elements on the heat transfer coefficient and friction factor of SAH. Additionally, an analysis is performed to assess the influence of flow direction relative to the absorber plate on heat transfer and friction factor. The study considers parameters such as Reynolds Number (Re) ranging from 2000 to 20000, relative roughness width (W/w) of 1, relative roughness pitch (P/e) of 10, relative roughness height (e/D) of 0.043, and an angle of attack (α) of 30°. The results indicate that the incorporation of V-ribs as artificial roughness in the SAH leads to increased Nusselt Number and friction factor compared to a smooth SAH, attributed to enhanced turbulence. The hot outlet air which is in the temperature range of 300 K to 355 K can be utilized for the drying of various foods, vegetables and grains.